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In what way is it short term?
A jacket lasts as long as it lasts. The outside is synthetic and not recyclable. synthetic down is largely air, so the % of the jacket is negligible imo. Happy to be corrected though. Ultimately there are cases where plastic materials are just better, so what can you do?
In any event I tend not to worry about these things as I buy few clothes and use them for a long time.
Eg I bought my uniclo one second hand in 2015 (which I'm pretty sure is not 100% down anyway). I will still wear it for gardening or as a underlayer for other coats in the winter. It has several repair patches on it, but the elastic in the cuffs is starting to go, hence wanting something new.
And short term.